Feed-water heater.



PATENTED JUNE 12, 1906.

' W. A. MOFPAT. FEED WATER HEATER. APPLIGATION FILED JUNE 16, 1905.

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UNITED STATES WALTER ANDREW MOFFAT, OF DENVER, COLORADO.

. FEED-WATER HEATER.

Specification of Letters Patent.

Patented June 12, 1906.

Application filed June 16.1905. Serial No. 265.576.

To all whom it may concern. Be it known that I, WALTER ANDREW MOFFAT, acitizen of the United States, residing at Denver, in the county ofDenver and State of Colorado, have invented new and useful Improvementsin Feed-Water Heaters for Stationary Boilers, of which the following isa specification. I

This invention relates to feed-water heaters' for boilers, beingespecially adapted for use in connection with stationary boilers, andhas for its objects to produce a comparatively simple inexpensive deviceof this character in which the feed-water will be thoroughly heatedprior to entrance into the boiler and forced into the boiler by its ownpressure, also one wherein steam will be conducted from the boiler tothe heater for creating a pressure in the latter to properly feed thewater, one wherein the smoke and other products of combustion will beutilized in heating the water, and one in which the water will becirculated through the smokebox,

fire-box, and ash-pit, or one or more of them.

With these and other objects in view the invention comprises the novelfeatures of construction and combination of parts more fully hereinafterdescribed.

In the accompanying drawings, Figure 1 is a front elevation of a boilerequipped with a feed-water apparatus embodying the invention. Fig. 2 isa vertical longitudinal section centrally through the same.

Referring to the drawings, 1 designates a stationary boiler providedwith a combustion-chamber 2, including an ash-pit 3, and adapted forcommunication through the medium of tubes or flues 4 with a smokechamber5, communicating with a smokestack 6, the boiler being provided with asteam-dome 7. These parts, except as hereinafter explained, are all ofthe usual or any appropriate construction and material and perform theordinary functions.

Communicating with and leading from the dome 7 is a steam pipe or duct8, opening into and communicating witha water-heating receptacle or tank9, preferably of the form herein shown, and having a central tubularportion or flue 10, centered within and constituting, in effect, a partor continuation of the stack 6, there being connected with the bottom ofthe tank 9 and communicating therewith a feed pipe or duct 11, extendedinto and discharging at its lower end at a point adjacent the bottom ofthe boiler 1. The pipe 11 is equipped with a check-valve (not shown) anda cut-off valve 12, while the pipe 8 has a cut-ofi' valve 13 and anexhaustvalve 14 of the usual construction and actuated by steam-pressurewithin the dome 7, there being provided on the tank 9 a pressure-gage 15and an exhaust-valve 16, both performing their usual functions, thelatter being connected with a pipe 17,leading from the heating-tank 9 toan ordinary exhaustheater or supply-tank and equipped with a check-valve18.

Connected at one end to the bottom of the tank 9, and having said endprojected slightly into the latter, is a water circulating and heatingpipe or duct 19, the other end of which enters and extends upwardthrough the tank, as at 20, for discharging at a point above the normalwater-level, the pipe 19 being provided between its ends with suitablecoils 21, disposed within the ash-pit 3, fire box, orcombustion-chamber. Disposed in the pipe 19 at points between the tank 9and coils21 is a pair of cut-off valves 22 and 23, through the medium ofwhich communication between the tank and coils may be cut off orestablished as circumstances require, said coils having suitable valveor valves for cleaning the same, while the tank 9 has connectedtherewith a supply-pipe 24, leading from an ordinary exhaust-heater orsupplytank adapted for replenishing the tank 9, said supply beingcontrolled by a valve 25. The tank and boiler are equipped,respectively, with water-gages 26 and 27, which latter alsocommunicatewith a steam-gage 28 for the boiler, while communicating with the tank 9is a pipe 29 for drawing off the contents of the tank 9.

In practice, the tank having been suitably filled with water and thevalves 22 and 23 opened, the water will circulate through the pipe 19and coils 21 through the smoke and fire box, whereby it will be heated,the temperature of the Water within the tank being further maintained bythe action of the heated smoke and other products of combustionpassing'through the tubular section 10. Steam drawn, if needed, from thedome 7 through the pipe 8 is admitted into the steamspace at the top ofthe tank 9, thereby equalizing the pressure in the boiler and tank andpermitting water to flow from the latter into I the boiler by gravity,it being apparent that undue pressure in the tank will be relieved bythe safety-valve 16. It is also obvious that the quantity of watersupplied to the boiler 1 from the tank may be controlled through themedium of valve 12.

From the foregoing it is apparent that I produce a simple deviceadmirably adapted for the attainment of the ends in view, and onewherein the feed-water will be thoroughly heated and properly suppliedto the boiler, and one wherein the surplus steam within the boiler willbe utilized, if required, for creating the requisite pressure within thetank 9, it being understood that in attaining these ends minor changesin the details herein set forth may be resorted to without departingfrom the spirit of the invention.

Having thus fully described the invention, what is claimed as new is 1.In a device of the class described a boiler having a steam-space and acombustion chamber, a feed-water receptacle having a steam-spaceoperatively connected with the steam-space of the boiler, connectionsbetween the receptacle and boiler for supplying water to the latter, anda circulating pipe communicating at its ends with the receptacle andextended between its ends through the combustion-chamber 2. In a deviceof the class described a boiler provided with a combustion and smokechamber and having a steam-space, a feedwater receptacle communicatingwith the boiler for supplying water thereto and also having asteam-space, a duct communicating with the steam-spaces of the boilerand receptacle, and a circulating-pipe communicating at its ends withthe receptacle and having intermediate coils disposed in the combustionchamber, said pipe being extended between its ends through thesmokechamber.

3. In a device of the class described, a boiler provided with acombustion-chamber and a smoke-chamber and having a steam-space, afeed-water receptacle having a steam-space, and provided with an innerflue communicating with said smoke-chamber, a duct connecting thesteam-spaces of the boiler and receptacle, connections between thelatter and the boiler for supplying water thereto, and acirculating-pipe communicating at its ends with the receptacle andextended between its ends through the combustion and smoke chambers.

4. In a device of the class described a boiler provided with a fire-boxand smoke-chamber, and having a steam-space, a feed-water receptaclehaving a steamspace, and provided with an inner flue communicating withsaid smoke-chamber, a duct connecting the steamspaces of the boiler andreceptacle, connections between the latter and the boiler for providedbetween its ends with coils disposed in the fire-box, for heating thewater in the receptacle, said pipe having the usual valves for operatingand cleaning the same.

5. In a device of the class described a boiler provided with a fire-box,smoke-chamber and ash-pit, and having a steam-space, a feed-waterreceptacle having a steam-space, and provided with an inner fluecom1nunicating with said smokecha1nber,a duct connecting thesteam-spaces of the boiler and receptacle, connections between thelatter and the boiler for supplying water to boiler, and acirculating-pipe connecting at both ends with the receptacle andextended through the smoke-chamber, and provided between its ends withcoils disposed in the fire-box and ashpit, for heating the water in thereceptacle, said pipe having the usual valves for operating and cleaningthe same.

6. In a device of the character described, a boiler with a fire-box andsmoke-chamber, a feed-water receptacle having a steam space and providedwith an inner flue communicating with said smoke-chamber, a ductconnecting the steam-space of the boiler with. the steam-space of saidreceptacle, a valve for controlling said duct under the control of thesteam-pressure, connections between said receptacle and boiler forsupplying water to the boiler, and a circulating-pipe for said receptacle having a heating coil or coils disposed in said fire-box.

7. In a device of the character described, a boiler with a fire-box andsmokecharnber, a feed-water receptacle having a steam-space and providedwith an inner flue communicating with said smoke-chamber, a ductconnecting the steam-space of the boiler with the steam-space of saidreceptacle, a valve for controlling said ductunder the control of thesteanrpressure, a valve for the feed-water receptacle adapted to becontrolled by the pressure of steam therein, connections between saidreceptacle and the boiler for supplying water to the boiler, and acirculatingpipe for said receptacle having heating coil or coilsdisposed in said fire-box.

8. In a device of the character described, a boiler with a fire-box andsmoke-chamber, a feed-water receptacle having a steam-space and providedwith an inner flue communicating with said smoke-chamber, a ductconnecting the steam-space of the boiler with the steam-space of saidreceptacle, a valve for controlling said duct underthe control of thesteam-pressure, connections between said receptacle and boiler forsupplying water to the boiler, and a circulating pipe havingheatingcoils disposed in said fire-box below the grate thereof.

9. In a device of the character described, a boiler with a fire-box andsmoke-chamber, a feed-water receptacle having a steam-space and providedwith an inner flue communicat- IIO ing with said smoke-chamber, a ductconchamber and having heating-coils disposed necting the steam-space ofthe boiler with within said fire-box.

the steam of said receptacle, a valve for con- In testimony whereof Iaffix my signature trolling said duct under the control of theinpresence of two witnesses.

steam-pressure, connections between said re- WALTER ANDREW MOFFAT.ceptacle and boiler for supplying water to the Witnesses:

boiler, and a circulating-pipe for said recep- DAVID B. GRAHAM,

tacle, the same extending from the smoke- JOHN W. GRAHAM, Jr.

